Connectors are also called connectors. Between the blocked or isolated circuits in the circuit, a communication bridge is set up, so that the current flows and the circuit achieves the predetermined function. It is also called a connector and a socket in China, and generally refers to an electrical connector. That is, a device that connects two active devices and transmits current or signals.
性能 Performance of connectors
  1. Mechanical performance: As far as the connection function is concerned, the insertion force is an important mechanical property.
  Insertion and extraction force is divided into insertion force and extraction force (extraction force is also called separation force), the requirements of the two are different. In the relevant standards, there are provisions for large insertion force and small separation force, which indicates that from the perspective of use, the insertion force is small (thus a structure with a low insertion force LIF and a non-insertion force ZIF), and the separation force is too small, It will affect the reliability of the contact.
  Another important mechanical property is the mechanical life of the connector. Mechanical life is actually a durability index, which is called mechanical operation in the national standard GB5095. It takes one insertion and one extraction as a cycle, and judges whether the connector can normally complete its connection function (such as contact resistance value) after a specified insertion and removal cycle. The insertion force and mechanical life of the connector are related to the contact structure (positive pressure), the quality of the plating at the contact area (coefficient of sliding friction), and the dimensional accuracy of the contact arrangement (alignment).
  2. Electrical performance: The main electrical properties of the connector include contact resistance, insulation resistance and electrical strength.
  ① Contact resistance: High-quality electrical connectors should have low and stable contact resistance. The contact resistance of a connector ranges from a few milliohms to tens of milliohms.
  ② Insulation resistance: An index to measure the insulation performance between the contacts of electrical connectors and between the contacts and the housing, which ranges from hundreds of megohms to several gigaohms.
  ③ Anti-electrical strength: It is also called withstand voltage and dielectric withstand voltage. It is the ability to withstand the rated test voltage between the contacts of the connector or between the contact and the housing.
  ④ Other electrical properties: The electromagnetic interference leakage attenuation is used to evaluate the electromagnetic interference shielding effect of the connector, and the electromagnetic interference leakage attenuation is used to evaluate the electromagnetic interference shielding effect of the connector. It is generally tested in the frequency range of 100MHz ~ 10GHz.
  射频 For RF coaxial connectors, there are also electrical specifications such as characteristic impedance, insertion loss, reflection coefficient, and voltage standing wave ratio (VSWR). Due to the development of digital technology, in order to connect and transmit high-speed digital pulse signals, a new class of connectors, namely high-speed signal connectors, has appeared. Correspondingly, in terms of electrical performance, in addition to characteristic impedance, some new electrical indicators have also appeared , Such as crosstalk, transmission delay, skew, etc.